Blue fire / John Gilstrap.

"They call it Hell Day--a world war that lasted less than twenty-four hours. Nations unleashed weapons that destroyed more than a century's worth of technology. Those who survived must live as their ancestors did, off a land ruled by the whims of nature. One-time congressional representative Victoria Emerson has become the new leader of the small town of Ortho, West Virginia. She has been struggling to provide food and shelter for the town's inhabitants, while coping with desperate refugees. An autumn morning's calm is shattered when her teenage son sounds the alarm with the cry 'Blue Fire'--the code phrase for imminent danger. A band of National Guardsmen intends to take Ortho and its resources for themselves. They have enough soldiers and firepower to eliminate anyone who dares to stop them. But Victoria swore an oath to defend and protect her people, and she isn't about to surrender"--